若丨x丨=5,丨y丨=3,且x>0,y>0,求3x+5y的值

若丨x丨=3,丨y丨=5,且丨x+y丨=(x+y),则x-y的值为 ,已知x 若丨x丨=5,丨y丨=2,且x>y>0,求x十y的值 若丨x丨=3,丨y丨=5,且丨x-y丨=-(x-y).求丨x-3丨+(y-5)²的值 若丨x丨=3,丨y丨=5,且丨X+Y丨=－X－Y,求X－Y的值 若丨x丨=5,丨y丨=3,且x>0,y>0,求3x+5y的值 /x/=8./y/=6求x+y的值若/x/=3/y/=5丨x丨=8,丨y丨=6,求x+y的值;若丨x丨=3,/y/ =5,且丨x-y丨=y-x,再求x+y的值 若丨x丨=3,丨y丨=2,且丨x-y丨=y-x,求x+y的值. 丨x丨=3,丨y丨=5,且丨x+y丨=-x-y,求x-y的值 已知x、y满足约束条件X+Y》0且x-y+5≥0且X《3,则Z=丨4x-y丨的最大值是?最好有图! 若丨x+y-3丨+根号2x-y=0,则x-y= 若丨x丨=2,丨y丨=3,且2x/y＜0,则x+y=多少?是等于1或-1吗? 若丨x丨=5,丨y丨=2,且x＞y＞0,求x+y的值 若丨x丨=5,丨y丨=2,且x>y>0,求x十y的值要格式 (x+y)(x+y-10)+25=0,且x-y=3,求x,y (x+y)(x+y-10)+25=0,且x-y=3,求x,y 若丨2x-5丨+(2x-5y+20)^2=0,求代数式(-2x^2)-2x(5y-2x)=3y(6x-5y)-3y(4x-5y)的值 若丨3x+4y-1丨+(3y+2x-5)²=0,则x= ,y= 已知丨x丨等于5,丨y丨=8,且丨x-y丨=y-x,求x+y的值